Dual Transistor Synchronous Forward Controller Features: High Voltage: Operation Up to 72V Synchronizable Operating Frequency and Output Switch Phase for Multiple Controller Systems Fixed Frequency Operation to 350kHz Adaptive and Adjustable Blanking Synchronous Rectifier Driver Local 1% Voltage Reference Undervoltage Lockout Protection with Hysteresis Input Overvoltage Protection Programmable Start Inhibit Transformer Primary Saturation Protection Optocoupler Feedback Support Soft-Start Control

Slew Rate Controlled Ultralow Noise Push-Pull DC/DC Controller Features: Greatly Reduced Conducted and Radiated EMI Low Switching Harmonic Content Independent Control of Output Switch Voltage and Current Slew Rates Greatly Reduced Need for External Filters Dual N-Channel MOSFET Drivers 20kHz to 250kHz Oscillator Frequency Easily Synchronized to External Clock Regulates Positive and Negative Voltages Easier Layout Than with Conventional Switchers

100mA, Low Noise, LDO Micropower Regulators in TSOT-23 Features: Low Noise: 20μVRMS (10Hz to 100kHz) Low Quiescent Current: 20μA Wide Input Voltage Range: 1.8V to 20V Output Current: 100mA Very Low Shutdown Current: <0.1μA Low Dropout Voltage: 300mV at 100mA Fixed Output Voltages: 1.2V, 1.5V, 1.8V, 2V, 2.5V, 2.8V, 3V, 3.3V, 5V Adjustable Output from 1.22V to 20V Stable with 1μF Output Capacitor Stable with Aluminum, Tantalum or Ceramic Capacitors Reverse-Battery Protected No Reverse Current No Protection Diodes Needed Overcurrent and Overtemperature Protected Available in Tiny 5-Lead TSOT-23 Package

100mA, Low Noise, LDO Micropower Regulators in TSOT-23 Features: Low Noise: 20μVRMS (10Hz to 100kHz) Low Quiescent Current: 20μA Wide Input Voltage Range: 1.8V to 20V Output Current: 100mA Very Low Shutdown Current: <0.1μA Low Dropout Voltage: 300mV at 100mA Fixed Output Voltages: 1.2V, 1.5V, 1.8V, 2V, 2.5V, 2.8V, 3V, 3.3V, 5V Adjustable Output from 1.22V to 20V Stable with 1μF Output Capacitor Stable with Aluminum, Tantalum or Ceramic Capacitors Reverse-Battery Protected No Reverse Current No Protection Diodes Needed Overcurrent and Overtemperature Protected Available in Tiny 5-Lead TSOT-23 Package

100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators Features: Wide Input Voltage Range: 3V to 60V Low Quiescent Current: 6mA Internal 5A Switch (2.5A for LT1171, 1.25A for LT1172) Shutdown Mode Draws Only 50μA Supply Current Very Few External Parts Required Self-Protected Against Overloads Operates in Nearly All Switching Topologies Flyback-Regulated Mode Has Fully Floating Outputs Comes in Standard 5-Pin Packages LT1172 Available in 8-Pin MiniDIP and Surface Mount Packages Can Be Externally Synchronized

100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators Features: Wide Input Voltage Range: 3V to 60V Low Quiescent Current: 6mA Internal 5A Switch (2.5A for LT1171, 1.25A for LT1172) Shutdown Mode Draws Only 50μA Supply Current Very Few External Parts Required Self-Protected Against Overloads Operates in Nearly All Switching Topologies Flyback-Regulated Mode Has Fully Floating Outputs Comes in Standard 5-Pin Packages LT1172 Available in 8-Pin MiniDIP and Surface Mount Packages Can Be Externally Synchronized

100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators Features: Wide Input Voltage Range: 3V to 60V Low Quiescent Current: 6mA Internal 5A Switch (2.5A for LT1171, 1.25A for LT1172) Shutdown Mode Draws Only 50μA Supply Current Very Few External Parts Required Self-Protected Against Overloads Operates in Nearly All Switching Topologies Flyback-Regulated Mode Has Fully Floating Outputs Comes in Standard 5-Pin Packages LT1172 Available in 8-Pin MiniDIP and Surface Mount Packages Can Be Externally Synchronized

100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators Features: Wide Input Voltage Range: 3V to 60V Low Quiescent Current: 6mA Internal 5A Switch (2.5A for LT1171, 1.25A for LT1172) Shutdown Mode Draws Only 50μA Supply Current Very Few External Parts Required Self-Protected Against Overloads Operates in Nearly All Switching Topologies Flyback-Regulated Mode Has Fully Floating Outputs Comes in Standard 5-Pin Packages LT1172 Available in 8-Pin MiniDIP and Surface Mount Packages Can Be Externally Synchronized

100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators Features: Wide Input Voltage Range: 3V to 60V Low Quiescent Current: 6mA Internal 5A Switch (2.5A for LT1171, 1.25A for LT1172) Shutdown Mode Draws Only 50μA Supply Current Very Few External Parts Required Self-Protected Against Overloads Operates in Nearly All Switching Topologies Flyback-Regulated Mode Has Fully Floating Outputs Comes in Standard 5-Pin Packages LT1172 Available in 8-Pin MiniDIP and Surface Mount Packages Can Be Externally Synchronized

500mA Negative Low Dropout Micropower Regulator Features: Operating Current: 45μA Adjustable Current Limit Low Voltage Linear Dropout Characteristics Stable with Wide Range of Output Capacitors Shutdown Current: 10μA Positive or Negative Shutdown Logic Fixed 5V and Adjustable Versions Tolerates Reverse Output Voltage Available in 8-pin PDIP and SO Packages, 3-lead SOT-223, 5-Pin Surface Mount DD and Through-Hole TO-220 Packages